[Milsurplus] Unknown Collins Audio box

[Peter Gottlieb]

I remember those!  I haven't seen one in ages.

The phone company used to use those on private (dedicated) 4 wire circuits.  It 
contains two audio amps and a 2 to 4 wire converter hybrid which can be adjusted 
for best match.

The local phone system needs a 2 wire setup but dedicated lines, which may 
possibly have radio links in them, need a separate circuit for send and receive.

IIRC, those little amps made fairly decent headphone amps back in the day.  Of 
course now a single chip has better fidelity, uses much less power, and is more 
reliable.

Peter


On 10/14/2014 12:03 PM, Doug Hensley wrote:
>
>
> Can anyone identify or provide any clues as to what this went to, came out ofor otherwise might be useful to ?
> http://www.w5jv.com/Staged_for_Identifying/Collins_Unk_Audio_Module_Set/
> The lower three modules sport the familiar Collins audio naming habit.
>
> Thanks in advance for any information,
> Doug W5JV/NNN0BXX
>
>
>
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